Abstract
Near infrared (NIR) Raman spectroscopy has been used to investigate the deformation behaviour of highly oriented fibres and tapes made from thermotropic aromatic copolyesters. It has been found that a number of Raman bands of thermotropic aromatic copolyesters show linear shifts towards lower wavenumbers with stress and strain following tensile deformation. The strain and stress dependencies of the 1600cm−1 band due to stretching of the p-phenyl ring, have been studied in detail and discussed in relation to values reported for high-performance aromatic polymer fibres. The behaviour has been discussed in terms of the microstructure of the thermotropic aromatic copolyester materials compared with that of other highly-oriented aromatic polymer fibres.
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